TestingtheSteeringCircuit–ChargePumpFlow(MachineSerial
Numbersabove316000000)
g226658
Figure72
Thechargepumpisdesignedtosatisfythesteeringcylinderneeds(atfull
speed).ThechargepumpowtestcomparesuidowatNoLoadwithuid
owUnderLoad.Adropinowunderloadofmorethan15%indicatesthe
gearsandwearplatesinthepumphaveworn.Continuedoperationwithaworn
pumpcangenerateexcessiveheatandcausedamagetothesealsandother
componentsinthehydraulicsystem.
SpecialEquipmentRequired:Flowmeterwithpressuregaugethathasatleasta
16L/minute(5gallons/minute)capacity.
TestProcedure
1.ParkthemachineonalevelsurfacewiththePTOswitchoff,lowerthecutting
deck,shutofftheengine,andsettheparkingbrake.
2.ReadallWarning,Cautions,andprecautionslistedatthebeginningofthis
section.
CAUTION
Beforeopeningthehydraulicsystem,operateallthehydraulic
controlstoreleasesystempressureandavoidinjuryfromthe
pressurizedhydraulicuid;refertoReleasingPressurefromthe
HydraulicSystem(page5–6).
Groundsmaster
®
3280-D/3320
Page5–69
HydraulicSystem:TestingtheHydraulicSystem
05138SLRevB
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